Patent EP1329983A2 successfully refreshed from Google Patents.
EP1329983A2
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EP
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Array antenna calibration apparatus and array antenna calibration method
Assignee: NEC Corp
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Filing: 2003-01-17
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Granted: —
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Expires: 2023-01-17
Abstract
Abstract An array antenna calibration apparatus simple in configuration and inexpensive while ensuring an accurate calibration of an array antenna is provided. This array antenna calibration apparatus includes supply means supplying original calibration signals to a plurality of antenna elements constituting an array antenna, the original calibration signals being orthogonal to one another among the antenna elements; a phase and amplitude characteristic calculation means calculating correlations between calibration signals, which are emitted from the antenna elements and received by the adjacent antenna elements, and the original calibration signals related to the received calibration signals; a relative calibration factor calculation means obtaining a relative calibration factor among all the antenna elements constituting the array antenna based on phase and amplitude characteristics of the respective antenna elements; and calibration means calibrating transmission signals to be supplied to the respective antenna elements based on the relative calibration factor.
Inventors
- 👤 Masashi c/o NEC Corporation Hirabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 12:58
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/267
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
An array antenna calibration apparatus comprising: supply means for supplying original calibration signals to a plurality
of antenna elements constituting an array antenna, respectively, the
original calibration signals being orthogonal to one another among the
antenna elements; phase and amplitude characteristic calculation means for calculating
correlations between calibration signals, emitted from the antenna elements
and received by the adjacent antenna elements, and the original calibration
signals related to the received calibration signals; relative calibration factor calculation means for obtaining a relative
calibration factor among all the antenna elements constituting the array
antenna based on phase and amplitude characteristics of the respective
antenna elements; and calibration means for calibrating transmission signals to be supplied
to the respective antenna elements based on the relative calibration factor.
Claim 2
Dependent Claim
233 words
The array antenna calibration apparatus according to claim 1,
wherein the antenna elements constituting the array antenna are classified
into a first group and a second group, and the relative calibration factor calculation means comprises: first relative calibration factor calculation means for obtaining a
relative calibration factor among all of the antenna elements belonging to
the first group based on the phase and amplitude characteristics of all the
antenna elements of the first group; second relative calibration factor calculation means for obtaining a
relative calibration factor among all of the antenna elements belonging to
the second group based on the phase and amplitude characteristics of all the
antenna elements of the second group; third relative calibration factor calculation means for obtaining a
relative calibration factor between the first group and the second group
based on the phase and amplitude characteristics of one of the antenna
elements belonging to the first group and the phase and amplitude
characteristics of one of the antenna elements belonging to the second
group; and fourth relative calibration factor calculation means for obtaining a
relative calibration factor among all the antenna elements constituting the
array antenna based on the relative calibration factor among all the
antenna elements belonging to the first group, the relative calibration factor
among all the antenna elements belonging to the second group, and the
relative calibration factor between the first group and the second group.
Claim 3
Dependent Claim
109 words
The array antenna calibration apparatus according to claim 2,
comprising: synthesizing means for synthesizing the calibration signal received
by one of the antenna elements belonging to the second group from one of
the antenna elements belonging to the first group with the calibration signal
received by the one antenna element belonging to the first group from the
one antenna element belonging to the second group, and wherein the third relative calibration factor calculation means obtains the
relative calibration factor between the first group and the second group
based on the phase and amplitude characteristic obtained by the phase and
amplitude characteristic calculation means based on the synthesized
calibration signal.
Claim 4
Dependent Claim
128 words
An array antenna calibration method comprising: a supply step of supplying original calibration signals to a plurality
of antenna elements constituting an array antenna, respectively, the
original calibration signals being perpendicular to one another among the
antenna elements; a phase and amplitude characteristic calculation step of calculating
correlations between calibration signals, emitted from the antenna elements
and received by the adjacent antenna elements, and the original calibration
signals related to the received calibration signals; a relative calibration factor calculation step of obtaining a relative
calibration factor among all the antenna elements constituting the array
antenna based on phase and amplitude characteristics of the respective
antenna elements; and a calibration step of calibrating transmission signals to be supplied
to the respective antenna elements based on the relative calibration factor.
Claim 5
Dependent Claim
237 words
The array antenna calibration method according to claim 4, wherein the antenna elements constituting the array antenna are classified
into a first group and a second group, and the relative calibration factor calculation step includes: a first relative calibration factor calculation step of obtaining a
relative calibration factor among all of the antenna elements belonging to
the first group based on the phase and amplitude characteristics of all the
antenna elements of the first group; a second relative calibration factor calculation step of obtaining a
relative calibration factor among all of the antenna elements belonging to
the second group based on the phase and amplitude characteristics of all the
antenna elements of the second group; a third relative calibration factor calculation step of obtaining a
relative calibration factor between the first group and the second group
based on the phase and amplitude characteristics of one of the antenna
elements belonging to the first group and the phase and amplitude
characteristics of one of the antenna elements belonging to the second
group; and a fourth relative calibration factor calculation step of obtaining a
relative calibration factor among all the antenna elements constituting the
array antenna based on the relative calibration factor among all the
antenna elements belonging to the first group, the relative calibration factor
among all the antenna elements belonging to the second group, and the
relative calibration factor between the first group and the second group.
Claim 6
Dependent Claim
112 words
The array antenna calibration method according to claim 5,
comprising: a synthesizing step of synthesizing the calibration signal, received
by one of the antenna elements belonging to the second group from one of
the antenna elements belonging to the first group, with the calibration
signal received by the one antenna element belonging to the first group from
the one antenna element belonging to the second group, and wherein in the third relative calibration factor calculation step, the relative
calibration factor between the first group and the second group is obtained
based on the phase and amplitude characteristic obtained in the phase and
amplitude characteristic calculation step based on the synthesized
calibration signal.
References Cited (Backward Citations)
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